Technical Papers 2015

Technical papers, application notes and case studies from laboratory, chemistry, life science and quality control

Determining the oxidation stability of fats and oils using the Rancimat methodMetrohm InternationalFoodstuffs that contain fat - like butter, nuts, cookies, and potato chips - turn rancid over time. This is caused by chemical changes in the fat; in particular, its oxidation. Because of this, determining the oxidation stability of fats and oils in foods has proven to be a useful tool in the qua...

Analysis of Phosphine in Dried Foodstuffs via Headspace-GC-MSDRoland Perz, Anne Benkenstein, Ellen Scherbaum, Chemisches und Veterinäruntersuchungsamt (CVUA) StuttgartPhosphine is one of the most widely used, cost-effective and rapidly acting fumigants. In EU legislation , maximum residue limits for the sum of phosphine and phosphides in foodstuff are set to within a range of 0.01 and 0.1 mg kg-1, depending on the commodity. A highly sensitive headspace-GC-MSD...

Direct Determination of Trace Elements in Body Fluids Using ICP-Mass SpectrometryDr. René Chemnitzer, Analytik Jena AGThe better understanding of the relevance of various elements in metabolic and other processes in organisms leads to increased interest in the analysis of biological samples like body fluids. Here, the focus is on supply of essential elements and detection of toxic elements. Fast and more sensiti...

From Light to Mind: Sensors and Measuring Techniques in Confocal MicroscopyDr. Rolf T. Borlinghaus, Leica Microsystems GmbHThis article outlines the most important sensors used in confocal microscopy. By confocal microscopy, we mean "True Confocal Scanning", i.e. the technique that illuminates and measures one single point only. The aim is not to impart in-depth specialist knowledge, but to give the user a small but ...

Determine sodium titrimetricallyMetrohm InternationalIn the presence of an excess of potassium and fluoride ions, sodium reacts exothermically with aluminum to produce NaK2AlF6 (elpasolite). This reaction is the cornerstone of a new method for determining sodium in foodstuffs using thermometric titration. Not only is it rapid, straightforward, and ...

Analysis of Nicotine and Impurities in Electronic Cigarette Solutions and VaporJason S. Herrington, Colton Myers, Amanda Rigdon, Restek GmbHElectronic cigarettes (e-cigarettes) are growing in popularity exponentially. Despite their ever-growing acceptance, relatively little work has been done to characterize their vapor. To date, the majority of e-cigarette research has focused on characterizing the solutions, which are ultimately va...

Speciation of arsenic in apple juice by LC-ICP-MSAndrew Ryan, Peio Riss, René Chemnitzer, Analytik Jena AGThe different physico-chemical forms of most elements vary in terms of mobility, toxicity and bioavailability. For example, arsenic species such as the inorganic trivalent arsenic (As III) and pentavalent arsenic (AsV) are highly toxic whereas the organic forms as monomethyl arsenic (MMA) and dim...

Chromium(VI) determination in toysMetrohm InternationalYou may deem the chance slim that mythical monsters are hiding underneath your offspring's beds. However, danger might be lurking there in the form of toy blocks, action fi gures, or crayons. Hazardous substances found in everyday items, including toys, pose a particular threat to children. Even ...